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    SubjectDMA blues... (Raid5 + Promise ATA/100)

    I have a software raid setup using the latest kernel, but the system keeps

    Each drive is connected to the respective ide port via ATA100 capable
    cables. Each drive is a slaves. The configuration is that
    /dev/hdc is a hot spare and /dev/hd[e,g,i,k,m,o,q,s] are all setup as raid
    5. These are all 75GB drives and are recognized as such.

    I have searched the linux-kernel archives and saw many posts addressing the
    problems that I was experiencing, namely the freezing caused by the code in
    the body of delay_50ms() in drivers/ide/ide.c. This was fixed in the
    current patch and as discussed earlier on the linux-kernel mailing list by
    using mdelay(50). This fixed the problems to some extent, the system
    seemed very reliable and I did not get a single "DriveStatusError BadCRC"
    or a "DriveReady SeekComplete Index Error" for a while. But after I had
    copied a large amount of data to the raid, about 17GB, the system crashed
    completely and could only be recovered by a cold reboot. Before using the
    latest patches, the system would usually crash after about 4-6GB of data
    had been moved. Here are the log entries...

    Feb 12 06:41:12 bertha kernel: hdo: dma_intr: status=0x53 { DriveReady
    SeekComplete Index Error }
    Feb 12 06:41:12 bertha kernel: hdo: dma_intr: error=0x84 { DriveStatusError
    BadCRC }
    Feb 12 06:45:42 bertha kernel: hdo: timeout waiting for DMA
    Feb 12 06:45:42 bertha kernel: hdo: ide_dma_timeout: Lets do it again!stat
    = 0x50, dma_stat = 0x20
    Feb 12 06:45:42 bertha kernel: hdo: irq timeout: status=0x50 { DriveReady
    SeekComplete }
    Feb 12 06:45:42 bertha kernel: hdo: ide_set_handler: handler not null;
    old=c01d0710, new=c01dac70
    Feb 12 06:45:42 bertha kernel: bug: kernel timer added twice at c01d0585.
    Feb 12 09:13:15 bertha syslogd 1.3-3: restart.

    Let me know If I should post any additional information that might help in
    troubleshooting. Is this a possible issue with the kernel code or is this
    a problem with hardware? Any help is appreciated...

    - Jasmeet Sidhu

    Some other info that might help:

    [root@bertha /root]# uname -a
    Linux bertha 2.4.1-ac9 #1 Mon Feb 12 02:43:08 PST 2001 i686 unknown

    Patches Applied to Kernel 2.4.1:
    1) ide.2.4.1-p8.all.01172001.patch
    2) patch-2.4.1-ac9

    Asus A7V VIA KT133 and Onboard Promise ATA100 Controller (PDC20267)
    1GHz AMD Thunderbird Athalon Processor
    Four Promise PCI ATA100 Controllers (PDC20267)
    Netgear GA620 Gigabit Ethernet Card

    Boot Drive (Root + Swap)
    hda: IBM-DTLA-307020, ATA DISK drive

    Raid 5 Drives:
    hdc: IBM-DTLA-307075, ATA DISK drive *SPARE*
    hde: IBM-DTLA-307075, ATA DISK drive
    hdg: IBM-DTLA-307075, ATA DISK drive
    hdi: IBM-DTLA-307075, ATA DISK drive
    hdk: IBM-DTLA-307075, ATA DISK drive
    hdm: IBM-DTLA-307075, ATA DISK drive
    hdo: IBM-DTLA-307075, ATA DISK drive
    hdq: IBM-DTLA-307075, ATA DISK drive
    hds: IBM-DTLA-307075, ATA DISK drive

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